CoMP Channel Feedback via Segmented Cell Reporting
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently reporting channel information for coordinated multi-point (CoMP) data transmission, which affects data transmission performance due to the complexity of coordinating multiple cells and the large amount of channel information that needs to be reported.
Innovation Solution
The implementation of various channel information reporting modes and configurations, such as single-stage, two-stage, and one-shot channel feedback configurations, allows user equipment (UE) to selectively report channel information for subsets of cells and subbands, reducing the reporting burden while ensuring effective CoMP data transmission. These modes include reporting channel information for single subbands across multiple cells, multiple subbands across a single cell, and other configurations that optimize feedback based on channel conditions and reporting capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel information for all cells in CoMP measurement set is reported in each reporting interval, then CoMP data transmission performance is improved, but feedback overhead and signaling burden increase significantly
Solution Approach 1:
The patent segments the CoMP measurement set into multiple subsets, where each subset contains a portion of the cells. The UE reports channel information for different subsets in different reporting intervals, rather than reporting all cells simultaneously. This segmentation reduces the amount of feedback overhead in each reporting interval while ensuring that channel information for all cells is eventually collected for CoMP transmission.
Solution Approach 2:
The patent implements periodic reporting of channel information for different cell subsets across multiple reporting intervals. Each subset is reported periodically, allowing the network to collect comprehensive channel state information over time without requiring excessive feedback in any single interval. This periodic action balances the need for complete channel knowledge with the constraint of limited feedback capacity.
2Loss of information
If channel information for multiple cells is reported simultaneously, then complete channel state knowledge is achieved, but processing complexity and signaling burden increase
Solution Approach 1:
The patent divides the set of cells into multiple subsets and processes channel information for each subset separately in different reporting intervals. This segmentation reduces the processing complexity at each interval by limiting the number of cells that need to be handled simultaneously, while still achieving complete channel state knowledge through the aggregation of information from all subsets over time.
3Reliability
If channel information reporting includes all subbands for multiple cells, then transmission quality is optimized, but feedback payload size becomes unmanageably large
Solution Approach 1:
The patent segments both the spatial dimension (cells) and frequency dimension (subbands) of channel information reporting. By dividing cells into subsets and reporting their channel information across different reporting intervals, the patent reduces the feedback payload size in each interval. The network reconstructs the complete channel state by combining information from all subsets, maintaining transmission quality optimization without unmanageable feedback sizes.
Data Source
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AI summary
Techniques for reporting channel information are described. In one aspect, a plurality of channel information reporting modes are available to a user equipment (UE) for reporting channel information for coordinated multi-point (CoMP) data transmission. The UE may determine a first channel information reporting mode to use, determine first channel information related to at least one cell in a CoMP measurement set of the UE, and send the first channel information in accordance with the first channel information reporting mode to one or more cells in the CoMP measurement set. The UE may also determine a second channel information reporting mode to use, determine second channel information related to multiple cells in the CoMP measurement set, and send the second channel information in accordance with the second channel information reporting mode. A plurality of channel feedback configurations may be supported, including a single-stage, a two-stage, and/or a one-shot channel configurations.